Black Screen After Nvidia Driver Update

Hi. We are having this issue on W7 x86 Ultimate with an Asus M2N-VM DH mobo, which has an NVIDIA GeForce 6150 SE / nForce 430 GPU. If we leave the default driver that Windows installs, we can use Media Center full screen, BUT we can't run the native resolution of the monitor, which is an LG L245WP-BN. When we try to run the install disk supplied with the mobo, which supposedly contains Vista drivers, we get an error saying they "can't be installed on this operating system."
We've been able to install nVidia drivers from other sources, but with *all* the ones we've tried so far, including the 275.33 mentioned here, we get a black screen (with sound) when Media Center is in full-screen mode.
Previously we were running XP MCE and had no such problem.
Any help would be appreciated.

Hi Lestrad. This thread is old and I am now using the 295.73 driver from Feb 2012. did you try using Driver sweep I linked to in previous post, reboot and install a newer driver. Download the driver first, Run Sweeper, go to Device manager and click your display adapter.
In the driver tab, Update or install driver and choose browse my computer and point to the driver folder you downloaded. This will install the driver only and not the rest of nVIDIA bloat.